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Alkyl aromatic isomerization catalyst and preparation and application thereof

A technology for an alkyl aromatic hydrocarbon and a catalyst, which is applied to an alkyl aromatic hydrocarbon isomerization catalyst and the fields of preparation and application thereof, can solve the problems of low ethylbenzene conversion rate, unsatisfactory catalyst activity and selectivity, and difficulty in meeting production needs in overall performance. , to achieve the effect of high aromatic isomerization and de-side chain alkyl activity, high isomerization selectivity

Pending Publication Date: 2021-02-02
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the ethylbenzene conversion rate of these catalysts is low, and the overall performance cannot meet the current production needs.
[0006] WO98 / 05613 introduces a deethylation-type isomerization catalyst system, which includes three beds of catalysts, and introduces activated alumina with hydrogenation function to support Mo and other components in the second bed, in order to ensure that The olefin intermediates such as ethylene generated in the dealkylation process are saturated in time to reduce the degree of side reactions such as alkylation caused by it. From the results of the examples, the activity and selectivity achieved by the catalyst are not ideal

Method used

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  • Alkyl aromatic isomerization catalyst and preparation and application thereof
  • Alkyl aromatic isomerization catalyst and preparation and application thereof
  • Alkyl aromatic isomerization catalyst and preparation and application thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0021] The preparation method of catalyst of the present invention comprises the steps:

[0022] (1) Mix the sodium-type high-silicon five-membered ring zeolite and the macroporous pseudoboehmite evenly, add the aqueous solution of peptizer and knead, then shape, dry, and roast in the air at 400-650°C;

[0023] (2) Ion-exchange the solid calcined in step (1) with an ammonium salt solution, wash and dry the obtained solid, and impregnate it with a solution of a noble metal compound. After the impregnated solid is dried, it is roasted at 400-600° C. in air.

[0024] The method (1) step is carrier molding, mixing sodium-type high-silicon five-membered ring zeolite and large-pore pseudo-boehmite, adding an aqueous solution of peptizer and kneading, and the peptizer is preferably nitric acid, which is made after adding water The concentration of the nitric acid solution is preferably 1 to 5% by mass, more preferably 1.5 to 3.5% by mass. The addition amount of the nitric acid aqueo...

example 1

[0043] (1) Preparation of carrier

[0044] Take SiO 2 / Al 2 o 3 NaZSM-5 with a molar ratio of 80 and macroporous pseudoboehmite powder (manufactured by Fushun Petrochemical Company Catalyst Factory, brand YH-2) were mixed at a dry basis mass ratio of 65:35. After adding an aqueous solution of nitric acid with a concentration of 2% by mass, which accounts for 40% of the total mass of the powder, and kneading, extrusion molding, drying at 120°C for 2 hours, and roasting in air at 600°C for 3 hours to obtain a composite carrier, the macroporous pseudoboehmite The pore volume of YH-2 is 0.96mL / g, and the specific surface area is 364m 2 / g, the pore distribution is shown in Table 1.

[0045] (2) Preparation of catalyst

[0046] Get 100 grams of the composite carrier that (1) step makes, use the NH that concentration is 3 mass % 4 Cl aqueous solution carries out ion exchange at 90 DEG C for 2 hours, then immerses in 65 DEG C for 12 hours with chloroplatinic acid solution with ...

example 2

[0048] Prepare catalyzer by the method for example 1, difference is (1) in step, replace macroporous pseudo-boehmite YH-2 with macroporous pseudo-boehmite YH-15 (Fushun Petrochemical Company Catalyst Factory production), described macroporous pseudo-boehmite YH-2 Pseudoboehmite YH-15 has a pore volume of 1.05mL / g and a specific surface area of ​​368m 2 / g, the pore distribution is shown in Table 1, the composition of the prepared catalyst D is shown in Table 2, and the physical properties are shown in Table 3.

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Abstract

The invention provides an alkyl aromatic isomerization catalyst which comprises a composite carrier and 0.005-0.2% by mass of precious metal calculated on the basis of the composite carrier, the composite carrier comprises 45-75% by mass of high-silicon five-membered ring zeolite and 25-55% by mass of macroporous alumina, the total pore volume of the catalyst is 0.4-1.5 mL / g, and the total specific surface area of the catalyst is 350-500 m < 2 > / g. The catalyst is used for an aromatic isomerization reaction, can improve the reaction activity of xylene isomerization and removal of aromatic sidechain alkyl, and improves the selectivity of an isomerization catalytic reaction process.

Description

technical field [0001] The invention relates to an alkyl aromatic hydrocarbon isomerization catalyst and its preparation and application, in particular to a deside chain alkyl type alkyl aromatic hydrocarbon isomerization catalyst as well as its preparation method and application. Background technique [0002] In petrochemical plants, there are various processes that can produce C 8 Aromatic resources, in addition to p-, m-, and o-xylene, usually contain ethylbenzene. Using this as a raw material, p-xylene products can be obtained through the joint operation of unit technologies such as isomerization, rectification and adsorption separation. Since the boiling points of ethylbenzene and xylene are close, separation by rectification requires high energy consumption, low efficiency, and difficulty. Therefore, the method of converting ethylbenzene is often used to avoid the accumulation of ethylbenzene in the recycle stream of the combined unit. There are two ways to convert e...

Claims

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Application Information

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IPC IPC(8): B01J29/44B01J29/72B01J35/10C07C4/18C07C15/04C07C15/02
CPCB01J29/44B01J29/72C07C4/18B01J35/638B01J35/633B01J35/635B01J35/615C07C15/04C07C15/02Y02P20/52
Inventor 刘中勋周震寰康承琳王京梁战桥盖月庭阮迟王志强
Owner CHINA PETROLEUM & CHEM CORP
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